You can use [b][[/b]youtube=9leO28ydyfU[b]][/b] to show youtube movie as part of forum message at our site,where [u]9leO28ydyfU[/u] is the [u]id[/u] after [b]v=[/b] in the youtube URL.
e.g.

http://www.youtube.com/watch?v=9leO28ydyfU

and

http://www.youtube.com/watch?v=VOD5tuQ5wvo


Your doc file has been captured as an image file (attached).
[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=2105.0;attach=3911;image[/img]
However, I was not able to understand what you need.

[quote]The idea is that AIDS causing virus HIV-1 (green icozahedrons) move first from A to B and attaches to CD4 receptor via its counterpart the gp 120 in vertical position. During the movement the 3 inner gimbals (colored rings) should rotate gradually and locked i.e. match each other concentrically at the attachment.  [/quote]

1. Does B mean the initial condition in the previous simulation I have created for you?
2. Does A mean ROLL=90 and YAW=90?
3. Do you want A to become initial state and the simulation change from status A to status B?

[quote]
Then the attached HIV-1 (icosaeder) together with the CD4 receptor and the Lipid raft as well should move to the right side and attach the CCR5 co-receptor. The rings should stay at the same position as in B.[/quote]
4. What need to be done in the simulation to show status C???

Could you explain it in more detail?